Why won't some pdf-files open on tablet/phone?

I simply get the error saying: The document cannot be opened because it's not a valid pdf-document.
However I have no problems opening the file with my laptop, only my phone and tablet (Jellybean 4.2.2) won't open it.
My friends also have managed to open the file on their tablets (android/windows).
Have reinstalled and checked updates and tried other programs but none has worked for me.
I simply have no clue and would appreciate help.

Hey,
Seems like the problem was in the web browser I was using, as the file just
didn't download correctly.
Thanks for the help anyway, much appreciated.
Tuomo
2014-10-15 1:03 GMT+03:00 Tuomo Stenberg <[email protected]>:
Hey,
spent some time discussing this with some friends of mine and found out
that the document can be opened by downloading it to the computer and
transferring then to the tablet or phone. The difference is that when
downloading with tablet/phone I get a .pdf file, which only has some html
code. So I guess the problem has something to do with the encryption of the
file. Here are the 2 different files I get as attachments. After all this
might not have anything to do with adobe, but some other stuff I don't
really understand.
Tuomo
2014-10-14 22:26 GMT+03:00 Romil Mittal <[email protected]>:
>> Why won't some pdf-files open on tablet/phone? created by Romil
>> Mittal <https://forums.adobe.com/people/Romil+Mittal> in *Adobe Reader
>> for Android* - View the full discussion
>> <https://forums.adobe.com/message/6825723#6825723>
>>

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MotorAdmin wrote:
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This appears to have reduced the time to load a document. Thanks Jimb From: Anubha Goel <[email protected]>
To: jimb70395944 <[email protected]>
Sent: Friday, March 20, 2015 4:37 AM
Subject: You have been mentioned by Anubha Goel in Re: why does reader freeze while opening some pdf files and others open instantaneously? in Adobe Community
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You have been mentioned
by Anubha Goel in Re: why does reader freeze while opening some pdf files and others open instantaneously? in Adobe Community - View Anubha Goel's reference to you Hey jimb70395944, Please try disabling protected mode under 'Edit> Preferences> Security (Enhanced)' and uncheck 'Enable Enhanced Security' option.Then, try again and let me know. Regards,Anubha
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